3Com OfficeConnect 56K Business, Command Reference Manual

Page: 33 / 210

2
U
SING THE
AT C
OMMAND
S
ET
This chapter includes information about
■
Basic AT commands
■
Using S-Registers
■
Understanding bit-mapped S-Registers
Overview
You can use AT commands to change your modem settings at any time.
To send AT commands to your modem, you need to put your
communications software in Terminal Mode. In terminal mode, what you
type is sent directly to the modem.
General rules for
using AT commands
You must follow some general guidelines to send AT commands to your
modem:
■
Type AT before each command and press <ENTER> after each
command.
The exceptions are A/, A> and +++, which require neither AT nor
<ENTER>.
■
Leave zeroes off the end of AT commands. A missing numeric
parameter is assumed to be a zero. For example, ATE is equivalent to
ATE0.
■
Create compound commands of up to 56 characters between AT and
<ENTER>. See the following example.